{"nrhp_refnum":"88000776","name":"Bridge between Guilford and Hamilton Townships","other_names":[],"category":"structure","location":{"address":"LR 28033 over Conococheque Creek","address_restricted":false,"city":"Social Island","county":"Franklin County","state":"PA","lat":39.886012153000024,"lon":-77.71297873699996,"geom_source":"nps_gis"},"listed_date":"1988-06-22","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Engineering"],"significance_levels":["state"],"summary":{"what_it_is":"A stone arch bridge between Guilford and Hamilton Townships in Franklin County, Pennsylvania, spanning Conococheague Creek on a turnpike crossing. Construction date is unknown, with the form placing it before 1860.","why_significant":"The nomination describes it as one of four very fine nineteenth-century turnpike bridges in Franklin County. Its configuration and workmanship are described as typical of many stone arch bridges built in the county in that century, and few such stone bridges remain standing. Its use of roughly coursed local limestone, semi-pyramidal piers and coping are said to be typical of county bridges built before 1860.","narrative":"Stone arch bridge carrying vehicular traffic across the Conococheague Creek between Guilford and Hamilton Townships in Franklin County, Pennsylvania. Its construction date is unknown, though the form places it before 1860. The bridge has two arches, each spanning 36 feet, making them somewhat longer than those of comparable bridges in the county. Its piers are semi-pyramidal and built of roughly coursed local limestone, with roughly cut limestone coping along the top. The structure is recorded in F. F. Unger's 1941 study Old Bridges of Franklin County, where it is identified as bridge number 13. The bridge is regarded as one of four very fine turnpike bridges of the nineteenth century in the county, and few stone bridges of its kind still stand there. Its arches have been gunited and repointed, and the parapet cap has received concrete repairs. The nominated area covers the superstructure and substructure only, within a rectangle of about 100 by 25 feet.","period_of_significance":null,"architect_builder":null,"architectural_style":"Stone arch (camelback)","criteria":[],"status_note":"Arches gunnited and repointed; concrete repair to parapet cap; marked as altered.","vacant_flag":null,"machine_generated":true,"model":"claude-haiku-5-5","prompt_version":"v1.1-2026-10-29","generated_at":"2026-10-29 17:11:35.619808-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_PA/88000776.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/88000776/b1b242bdae-800.webp","url_1600":"https://nationalhistoricalregister.com/media/88000776/b1b242bdae-1600.webp","licence":"CC0","author":"Smallbones","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Bridge_in_Guilford_Twp_FrankCo_PA_1.JPG\" rel=\"noopener\">Smallbones</a>, <a href=\"http://creativecommons.org/publicdomain/zero/1.0/deed.en\" rel=\"license noopener\">CC0</a>, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Bridge_in_Guilford_Twp_FrankCo_PA_1.JPG"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71992955","wikipedia":"https://en.wikipedia.org/wiki/Bridge_between_Guilford_and_Hamilton_Townships","wikidata":"https://www.wikidata.org/wiki/Q4966330"},"indexable":true,"url":"https://nationalhistoricalregister.com/pennsylvania/franklin-county/bridge-between-guilford-and-hamilton-townships-88000776/"}